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Boron-containing phenolic–siloxane hybrid polymers through facile click chemistry route

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Abstract

Realization of easily processable, tough phenolic functional polymer materials is of high demand for composite applications. Herein, we report the synthesis of boron-containing phenolic–siloxane hybrid polymers through a facile copper-catalysed azide–alkyne click chemistry (CuAAC) approach. For this, phenolic resoles incorporated with boron (PFB) was propargyl-derivatized and then bridged through triazole moieties using telechelic α, ω azidated polydimethylsiloxane (AZ-PDMS). The propargylated boronated PF (PFBPr) resins exhibited high heat of reaction during thermal cure due to the prevalence of multiple reactions. PFBPr-siloxane hybrid co-polymers exhibited glass transitions in the ranges – 100 to – 75 °C and at 25–35 °C corresponding to soft segment and hard segments. Pyrolysed PFBPr-siloxane products showed mixed phase heterogeneous systems of B and SiC. Introduction of boron and silicon improved the degree of graphitization and reduced the graphite crystallite size of the carbonization products. The pyrolysed compounds of silicon and boron formed during high temperature were conducive for creating a layer of void-free graphitic ordered carbon that improved with boron and silicon content, as revealed by SEM images.

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Acknowledgements

The authors acknowledge Director, VSSC for permission to publish this work. Analytical support from the Analytical and Spectroscopy Division, VSSC, and Ceramic Matrix Products Division, VSSC, is also acknowledged.

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Authors and Affiliations

  1. Polymers and Special Chemicals Division, PCM Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala, 695022, India

    M. Satheesh Chandran, K. Sunitha & Dona Mathew

  2. Department Chemistry, SN College Varkala, Kollam, Kerala, India

    D. S. Gayathri

  3. Analytical and Spectroscopy Division, PCM Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala, 695022, India

    P. B. Soumyamol

Authors
  1. M. Satheesh Chandran
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  2. K. Sunitha
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  3. D. S. Gayathri
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  4. P. B. Soumyamol
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  5. Dona Mathew
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Correspondence to M. Satheesh Chandran.

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Chandran, M.S., Sunitha, K., Gayathri, D.S. et al. Boron-containing phenolic–siloxane hybrid polymers through facile click chemistry route. J Mater Sci 53, 2497–2510 (2018). https://doi.org/10.1007/s10853-017-1737-7

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  • DOI: https://doi.org/10.1007/s10853-017-1737-7

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